At the climax of the film Jessica is carrying a shotgun and uses it, then drops it to the floor. A few minutes later she reaches for it and grabs it, but when she pulls it closer to herself, she is suddenly holding a handgun instead of a shotgun.
Toward the beginning of the film, when Jessica is first escorted to the office, the clock reads 8:01pm. Later, the clock shows after midnight. At about 50 mins, the clock, though distorted through textured glass, appears to read 8:01 again.